The National Weather Service is keeping close watching on moist, unstable air that could turn into thunderstorms in and around El Cajon, Rancho San Diego, and possibly La Mesa. The convection air is flowing in from northwestern Mexico, where thunderstorms are rumbling along the U.S.-Mexico border. There also is an intense band of thunderstorms in the Anza Borrego Desert State Park, north of Interstate 8. Forecasters say lightning has already hit the ground in many areas.

The high at San Diego's Lindbergh Field will be 78-79 for the next few days. That's two to three degrees above normal. Conditions will be more uncomfortable across the inland valleys and foothills, where temperatures will be in the 80s and 90s. Escondido is expected to hit 95 on Thursday.

Seaside: Solspot.com says waves will rise to about 3' today in South County and 3' to 4' in North County.